CN2175481Y

CN2175481Y - Transformer with loss-free function

Info

Publication number: CN2175481Y
Application number: CN 93244439
Authority: CN
Inventors: 孙文耀
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-13
Filing date: 1993-11-13
Publication date: 1994-08-24
Anticipated expiration: 2003-11-13

Abstract

The utility model discloses a voltage transforming device, comprising an autotransformer, a current transformer detecting whether the current exists in the input loop or the output loop of the transformer, a relay controlled by an inducting circuit of the current transformer with the normally open contacts in the common coil of the autotransformer in series. When a load exists, the current transformer generates the induced current to cause the relay to work and the normally open contacts to close. So, only when the load is connected into, the autotransformer begins working, so the no-load loss of the transformer is completely eliminated.

Description

Transformer with loss-free function

The utility model relates to a kind of loss-free transformer.

The no-load loss of transformer is generally the 0.7-10% of its rated capacity, and in real work, transformer can be under the Light Condition for a long time, accumulation year in year out, and no-load loss is very big.With the family expenses pressurizer is example, and wasting with 2KVA(is 1%) the power pressurizer power to refrigerator.The freezer compressor refrigeration work time is each 3 minutes, 7 minutes at interval, and then there are 16.8 hours in 24 hours and are the compressor time of having a rest, that is pressurizer idle time, it wastes is 336 watts hours, adds up in every month to waste 10 degree.Compare with the monthly consumption (nearly ten supreme Baidu) of common family, this is a no small numeral.And industrial, because transformer efficiency is bigger, it wastes more surprising.

Existing various energy saving transformer is usually by selecting for use high-quality silicon steel sheet and design better electrical magnetic loop to reduce no-load current, but this can cause the transformer manufacturing cost to increase, and can not eliminate no-load loss fully.

The utility model purpose is to provide a kind of potential device of eliminating no-load loss fully.

The potential device of the present utility model of realizing above-mentioned purpose comprises: an autotransformer; Switch contact is serially connected in the recloser in the above-mentioned autotransformer common winding, when this recloser detects above-mentioned autotransformer and is connected to load, makes switch contacts, when non-loaded, switch contact is disconnected.

Because above-mentioned recloser can detect whether be connected to load, thus the work of control autotransformer, thereby autotransformer is not worked when not having load, wherein no current flows through, and has so just fundamentally eliminated no-load loss.

Preferred embodiment of the present utility model is described below with reference to the accompanying drawings.

Fig. 1 is the electrical schematic diagram of an embodiment of potential device of the present utility model.

Among Fig. 1, the 1st, autotransformer, certain point disconnects in its common winding 2, a pair of normally opened contact of serial connection current relay 3.The 4th, current transformer.

Shown in dotted line such when connecting load when the output of autotransformer 1, the input of transformer, series coil 5 and load promptly constitute a closed-loop path, wherein produce electric current.Current transformer 4 detects this electric current, exports a current signal and gives current relay 3, makes its action, makes the normally opened contact closure, and autotransformer 1 promptly begins operate as normal.

If in the transformer course of work, load is disconnected, then only has no-load current in the output loop.Under this no-load current, the undercurrent that produces responded to by current transformer 4 so that relay 3 keeps adhesive, thereby its normally opened contact disconnects the cut-out no-load current.

In foregoing circuit, current transformer 4 also can be arranged on the output of transformer.

Figure 1 shows that the situation of single-phase autotransformer, but the utility model is also applicable to three-phase transformer, in the case, the circuit structure that is each phase shown in Figure 1.

In addition, also available other the suitable switch element of current relay 3 replaces, as solid-state relay etc.

Preferred embodiment of the present utility model more than has been described, those of ordinary skill in the art can contrast and make various variations and unlikely disengaging scope of the present utility model.

Claims

1, a kind of potential device, comprise an autotransformer, it is characterized in that, also comprise a recloser, its switch contact is serially connected in the common winding of above-mentioned autotransformer, when this recloser detects above-mentioned autotransformer and is connected to load, makes above-mentioned switch contact closure, when non-loaded, above-mentioned switch contact is disconnected.

2, potential device as claimed in claim 1, it is characterized in that, described recloser comprises a current transformer and relay that is cascaded, described current transformer is connected on inputing or outputing in the loop of above-mentioned autotransformer, described relay has a pair of normally opened contact as above-mentioned switch contact, be serially connected in the common winding of autotransformer, the induced current that this relay is produced by above-mentioned current transformer is controlled and is moved.

3, potential device as claimed in claim 1 is characterized in that, described autotransformer is a single-phase transformer.

4, potential device as claimed in claim 1 is characterized in that, described autotransformer is a three-phase transformer, and each comprises a described recloser mutually.